Angular velocity Definition and 841 Threads

1. a solid sphere (I=0.4mr^2) of mass 1.5 kg and radius 15 cm moves down a 35 degrees incline 7m long. Assuming it started from rest, what is its angular velocity in rad/s at the bottom of the incline? a)71.27 b)32.25 c)49.98 d)61.69 3.i tried by plugging in the values and trying to...

An object whose moment of inertia is 4.10 kg/m^2 experiences the torque shown in the graph attached. What is the object's angular velocity at 2.70 s? Assume it starts from rest. My main problem i think is how to read the graph. How should i interpret the graph? What i would do first is...

Angular Velocity? A thin uniform rod is rotating at an angular velocity of 9.37 rad/s about an axis that is perpendicular to the rod at its center. As the figure indicates, the rod is hinged at two places, one-quarter of the length from each end. Without the aid of external torques, the rod...

1. Homework Statement theta(t) = 2t^3 + 5t^2 - 2t + 1 Find the angular velocity in rpm's at t = 2s if the radius of the circular path is 30 cm Basically I want to kno if i did this part of the problem right b/c my professor didn't give us a key for the practice exam 2. Homework...

AP Free - Response Question HELP! iNCLUDES angular velocity and acceleration http://www.fayar.net/east/Teacher.web/Math/young/APPC/APPC%201999/physics_c_m_99.pdf Mechanics 3 is the problem I really need help on. I tried to find the tension of the string by setting it equal to mg + Iwr, but...

Homework Statement The coefficient of static friction between the person and the wall is .61. The radius of the cylinder is 6.56 m. An amusement park ride consists of a large vertical cylinder that spins about its axis fast enough that any person inside is held up against the wall when the...

This is my first contact and please excuse my limited knowledge of physics. see attached sketch. If the steel plate is moved along the steel table in direction A at a given velocity, what is the formula for the angle to achieve maximum velocity of the wood block in direction B.

1. how would you set up an experiment to show angular velocity and angular accelaration that can be done in a classroom with classroom equipment?

Homework Statement "Many rivers, like hte Mississippi River, flow from north to south toward the equator. These rivers often carry a large amount of sediment that they deposit when entering the ocean. What effect does this redistribution of material have on the angular velocity of the earth...

A 73.9 kg shaft with a radius of 8.9 cm is spinning at a rate of 364.5 rpm. If a board leans against the outside providing a frictional force of 59.92 N, how long will it take for the shaft to stop rotating? Answer says 2.094 s. Problem I have is that my Inertia table doesn't list shaft...

Homework Statement A uniform solid sphere of radius r is placed on the inside surface of a hemispherical bowl with much larger radius R. The sphere is released from rest at an angle theta to the vertical and roles without slipping. Determine the angular speed of the sphere when it reaches the...

Homework Statement A device consisting of four heavy balls connected by low-mass rods is free to rotate about an axle. It is initially not spinning. A small bullet traveling very fast buries itself in one of the balls. In the diagram, m = 0.004 kg, v = 450 m/s, M1 = 1.4 kg, M2 = 0.3 kg, R1 =...

Homework Statement A 200g, 40-cm-diameter turntable rotates on frictionless bearings at 60 rpm. A 20g block sits at the center of the turntable. A compressed spring shoots the block radially outward along a frictionless groove in the surface of the turntable. What is the turntable's rotation...

Homework Statement consider a point on a bicycle wheel as the wheel turns about a fixed axis, neither speeding up nor slowing down. Compare the linear and angular velocities of the point. [The subsequent question asks about the linear and angular accelerations a. both are constant b. only...

Homework Statement A merry-go-round is a common piece of playground equipment. A 4 m diameter merry-go-round with a mass of 220 kg is spinning at 16 rpm. John runs tangent to the merry-go-round at 5.0 m/s, in the same direction that it is turning, and jumps onto the outer edge. John's mass is...

Homework Statement Gears A and B are connected by arm AB. The angular velocity at A is 60 rev. per minuter (clockwise), find the angular velocity at B if a) wAB = 40 rpm (counterclockwise) b) wAB = 40 rpm (clockwise) Homework Equations w=dTheta / dt w = v/r The Attempt at a...

Hello: I seem to be stuck on this one problem: "[FONT="System"]A meter stick is suspended vertically at a pivot point 0.26 meters from the top end. It is rotated on the pivot until it is horizontal and then released from rest. What will be its maximum angular velocity (in radians per...

A heavy uniform hoop of mass M and radius R rolls in a straight line on level ground without slipping. It encounters a step of height h, where h<R perpendicular to its path. On striking the corner of the step, the hoop does not rebound and has sufficient energy to just surmount it. If the...

I feel really dumb asking this... it seems like a really basic problem, but it's due tomorrow, I've got heaps of other stuff to do and I'm not getting anywhere with it. Here is the problem: "A uniform rod of length l is freely pivoted at one end. It's initially held horizontal, then...

A new topic for me, angular velocity. I haven't been able to solve this problem. Perhaps someone can help: A dog is running around a stationary turntable, with angular velocity w = 0.750 rad/s. The dog sees a bone 1/3 rev away. At that instant, the turntable begins to turn with angular...

The problem is problem 6 at http://viewmorepics.myspace.com/index.cfm?fuseaction=viewImage&friendID=128765607&imageID=1460003525 A long thin rod of mass M and length L with two balls of mass M1 (same mass for both) attached is allowed to rotate about the horizontal axis shown. The bar is...

A 20kg girl stands on a large turntable 4m from its center. The turntable has a moment of inertia (about its roation axis) of 200kgm^2. Assume that the girl is a point mass. a) Assume that the girl and turntable are rotating at 1 rad/s. If the girl walks inwards to a radius of 3m and...

A cockroach of mass m lies on the rim of a uniform disk of mass 4.29m that can rotate freely about its center like a merry-go-round. Initially the cockroach and disk rotate together with an angular velocity of 0.271 rad/s. Then the cockroach walks halfway to the center of the disk. (a) What then...

The problem has a picture of a rod on a 3 dimensional coordinate system and gives the measurements. The rod rotates around the line joining each of the two endpoints with a constant angular velocity of 12 rad/s. The problem has you do things in steps, first finding the components in x, y...

I have a question from an old exam, asking for the torque required to rotate a triangular shape about one of its sides. Please find the question attached, and any help is greatly appreciated. Until the picture gets approved: Find the torque needed to rotate a traingular plate of sides a, b...

A skater is initially spinning at a rate of 15 rad/s with a rotational inertia of 2.78 kg·m2 when her arms are extended. What is her angular velocity after she pulls her arms in and reduces her rotational inertia to 1.65 kg·m2? I have so much trouble with these problems because I haven't a...

just hoping to get this double checked: 10. A grindstone spinning at the rate of 8.3 rev/s has what approximate angular speed? a. 3.2 rad/s b. 26 rad/s c. 52 rad/s d. 81 rad/s answer: C, I simply did ; 2*π*8.3 rad/s = 52.1 rad/s. is this correct?

A solid uniform disk of mass m and radius R is pivoted about a horizontal axis through its center, and a small body of mass m is attached to the rim of the disk. If the disk is released from rest with the small body at the end of a horizontal radius, find the angular velocity when the body is at...

A particle in UCM goes from a point A to B. The change in it's momentum is 2j and change in the centripetal force is 8i .Where i and j are unit vectors along X and Y axis. What is the angular velocity of the particle ?

Alright, I am doing an experiment that involves rolling a marble down a curved railing in order to find its kinetic energy, both in terms of translation and rotation. My teacher recommended I set up two photogates in order to find the time taken for the ball to travel in between two points on...

Sir, In a double star system, 2 stars of masses m and M separated by a distance d rotate about their common centre of mass. What is their common angular velocity?

A merry-go-round is accelerated from rest by a child at a steady acceleration of 0.2 rad.s-2. 1)How long does it take for the merry go round to reach an angular velocity of 1.4 rad.s-1? 2)How many revolutions does the merry go round (and the child) make in this time? I believe I worked...

Does anyone know where I can find a list of angular velocities of different kinds of bullets fired from different kinds of guns?

A gymnast is performing a floor routine. In a tumbling run she spins through the air, increasing her angular velocity from 3.00 to 4.65 rev/s while rotating through one-half of a revolution. How much time does this maneuver take? ok I understand that I am going to be using one of the...

Can someone please help me with this problem: You are swinging a mass at the ned of a string contained in a vertical plane. The length of the string is r. The mass moves just enough to complete hte circle. The motion is a constant total energy and we take the sense of rotation as positive...

but let say there are thre rods which are joining together to become a stick but not straight.stick A,stick B and stick C.if the angular velocity of stick C is given,how can i find the angular velocity of stick A?? pls help...

does anybody knows how to find the angular velocity of the midpoint of a bar?? pls help...

does anyone knows that there are two rods A and B joining together at a point,if angular velocity of rod A is given,how can i fing the angular velocity of the other rod?? or any recommended website or materials related to angular velocity of rods and gear?? pls help...thanx

I have a problem involving a hand crank, an axle, and a bucket. The crank turns the axle. The axle lowers the bucket. When someone spins a hand crank, the angular velocity of the hand crank and the axle are the same right? I think it and they seem to be the same. The velocity of the...

This problem is from Tipler's Physics for Scientists and Engineers, Chapter 9, Problem 15. The tape in a standard VHS videotape cassette has a length L = 246 m; the tape plays for 2.0 h (Figure 9-36). As the tape starts, the full reel has an outer radius of about R = 45 mm, and an inner radius...

If I have a thin wheel of radius R attached to an axle of length R. The wheel rotates around an axis at the other end of the axle, parallel to the diameter of the wheel. that is, i rotate the wheel around one end of the axle so that the wheel goes around the end of the axle with frequency w...

A disc of moment of inertia 23.4 kg m2 is made to rotate about an axis through its centre by a torque of T . The disc starts from rest, and after {t} s has kinetic energy 632.2 J. Calculate the angular velocity (in rad s-1) after {b} s. if i work out the angular velocity from the KE=0.5*I*w^2...

how do you express angular velocity in spherical coordinates? like the Earth rotates with constant speed, so the direction of the angular velocity vector is out the north pole. if it was spherical coordinates , how do you specify that direction? i know that z = r cos theta so \hat{k} = r...

Angular velocity HELP! On a certain game show, contestants spin a wheel when it is their turn. One contestant gives the wheel an initial angular speed of 3.70 rad/s. It then rotates through one-and-one-quarter revolutions and comes to rest on the BANKRUPT space. Through what angle has the wheel...

a cockroach of mass m lies on the rim of a uniform disk of mass 10m that can rotate freely about its center like a merry go round. Initially the cockroach and disk rotate together with an angular velocity of \omega_0. Then the cockroach walks halfway to the center of the disk. What is the...

Hey, here's the question: You are an athlete on the high bar in a fully extended position 180 degrees from the right horizontal. My weight: 667.08N Center of mass:80.5cm Radius of gyration: 122 cm 1)Calculate the torque at the beginning of the bar and for every 30 degrees until the...

Here is the homework question... According to the Guinness Book of World Records, the highest rotary speed ever attained was 2010m/s(4500mph). The rotating rod was 15cm(6in.) long. Assume the speed quoted is that of the end of the rod. What is the centripetal acceleration of the end of the...

I got the following qn: In a circus performance, a large 5kg hoop of radius 3m rolls without slipping. If the hoop is given an angular speed of 3 rad/s while rolling on the horizontal and allowed to roll up a ramp inclined at 20 degrees with the horizontal, how far(measured along the incline)...

The angular position of a point on the rim of a rotating wheel is given by theta = 4* t - 3* t^2 + t^3, where theta is in radians if t is given in seconds. find the angular velocities as t = 1 and t = 5.5 i plugged the numbers into the given equation to get 2 and 97.625 then i divided by...

angular velocity help! Hi, I need help with the following 2 questions. My answers have ********* next to them. Any help is appreciated. Thank you. 1. A disk is rotating at a constant rate about a vertical axis through its center. Point Q is twice as far from the center of the disk as...